How to know exactly which physical partion contains data? Post: 302928516

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Operating Systems AIX How to know exactly which physical partion contains data? Post 302928516 by rbatte1 on Friday 12th of December 2014 09:10:59 AM

12-12-2014

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Are you wanting to shrink the filesystem, replace a disk or something? I'm wondering why you are so interested.

To shrink a filesystem on AIX is not simple task like it can by on some other operating systems, for instance RHEL 6 has an option to re-size up or down the filesystem and logical volume all in one command, although it requires it to unmount as part of the process.

On AIX you would need to either:-

Build a new filesystem of the required size, move the data and then remount the new filesystem to the correct location (making the change permanent for next boot etc.)
Backup the data, destroy and re-create the filesystem and then restore the data.

If you are looking to free up or replace a disk, then migratepv is your friend here. It can take a while depending how big your filesystem is, but it will (one at a time) make a copies the LPs to the target drive then remove the old one. Do not interrupt the process as this can leave you with inconsistencies in the volume group and logical volume information.

Code:

migratepv -l logical_volume  source_disk  target_disk

An alternate would be to use mirrors to achieve this if placement is critical. You can use mklvcopy to add a third copy to the new disk (and synchronise them) and then use rmlvcopy specifying to remove the one from the old disk. When making the 3rd copy, you can specify a map-file to force it to use the PPs on whichever disk in whichever order you want if that is important.

Whichever technique you use, you can empty a disk and remove it from the volume group for replacement or use elsewhere.

If I've missed the point, then let us know what you really need to know and we will try to help.

Regards,
Robin

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LEARN ABOUT V7

xfs_freeze

xfs_freeze(8)						      System Manager's Manual						     xfs_freeze(8)

NAME

       xfs_freeze - suspend access to an XFS filesystem

SYNOPSIS

       xfs_freeze -f | -u mount-point

DESCRIPTION

       xfs_freeze suspends and resumes access to an XFS filesystem (see xfs(5)).

       xfs_freeze  halts  new access to the filesystem and creates a stable image on disk.  xfs_freeze is intended to be used with volume managers
       and hardware RAID devices that support the creation of snapshots.

       The mount-point argument is the pathname of the directory where the filesystem is mounted.  The filesystem must be  mounted  to	be  frozen
       (see mount(8)).

       The  -f flag requests the specified XFS filesystem to be frozen from new modifications.	When this is selected, all ongoing transactions in
       the filesystem are allowed to complete, new write system calls are halted, other calls which modify the	filesystem  are  halted,  and  all
       dirty data, metadata, and log information are written to disk.  Any process attempting to write to the frozen filesystem will block waiting
       for the filesystem to be unfrozen.

       Note that even after freezing, the on-disk filesystem can contain information on files that are still in the process of	unlinking.   These
       files will not be unlinked until the filesystem is unfrozen or a clean mount of the snapshot is complete.

       The  -u	flag  is used to un-freeze the filesystem and allow operations to continue.  Any filesystem modifications that were blocked by the
       freeze are unblocked and allowed to complete.

       One of -f or -u must be supplied to xfs_freeze.

NOTES

       A copy of a frozen XFS filesystem will usually have the same universally unique identifier (UUID) as the original, and  thus  may  be  pre-
       vented from being mounted.  The XFS nouuid mount option can be used to circumvent this issue.

       In  Linux  kernel version 2.6.29, the interface which XFS uses to freeze and unfreeze was elevated to the VFS, so that this tool can now be
       used on many other Linux filesystems.

SEE ALSO

       xfs(5), lvm(8), mount(8).

																     xfs_freeze(8)